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Screenshot_20190721-221314.png 
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Dirty Pete
That looks really interesting, shame you couldn't get more detailed pics.....and say where it is. I'm guessing its a large fossil (clam/ammonite??) within a limestone boulder. Not sure what the darker material is...could it be the original organic material within the fossil has been converted to oil which migrated and stained the surrounding lime mud.......maybe???

Pete
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Wildflowers
20190721_220833.jpg thank you for your reply. It was found on kilve beach in Somerset .
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Dirty Pete
Hi,
I've seen the old oil retorts at Kilve where they processed the oil shales so maybe my theory isn't quite so mad. 
Pete
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estwing
It's the ventral impression of an ammonite fossil
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Dirty Pete
Theory#2: Ammonite forms the nucleus of a nodule in kerogen rich deposit, nodule is then incorporated into the lime mud, heat and pressure during diagenesis creates and mobilises the oil which then migrates outwards and solidifies. Pic#1 looks like the rock bled to death...any more theories?

Pete
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